Because Open-Loop Design only requires one iteration, it can be accomplished much faster and cheaper (Design costs only) than Closed-Loop Design. To reduce the design effort and associated design costs, as much of the ship design should be accomplished using Open-Loop Design. Unfortunately, this is not always possible or desirable. In a number of technical disciplines, the predictive abilities of our tools are not sufficiently accurate to perform Open-Loop Design without significant design margins that negatively impact the acquisition cost of the ship. Closed Loop Design is desirable when there is enough time and the cost of additional design iterations is offset by reductions in acquisition costs across the production run of ships.